The Kutsuki were a branch of the Sasaki family hailing from Omi Province. They served as the stewards of the Kutsuki manor in that province in the Kamakura period, and the house continued through the Warring States period and into the Edo period, when some of their members became bannermen (direct vassals of the shogun) or daimyo (provincial lords). "The archives of Kutsuki family" consist of historical documents passed down in the family through the years. The Cabinet Records Bureau purchased them from the Kutsuki in 1888. Containing more than 1,060 documents, the archives were designated an important cultural property in the first year of Heisei( 1989).
Sasaki Kutsuki Sadataka suppressed a riot by masterless samurais in Wakasa (presently Fukui Prefecture) in the 3rd year of Kyotoku (1454). This document shows that in the 2nd year of Choroku (1458), the Kutsuki area of the Takashima County, Omi (presently Takashima City) was awarded to him for this success, with the signature of Ashikaga Yoshimasa, the 8th shogun of the Muromachi shogunate government.